[issue39550] isinstance accepts subtypes of tuples as second argument

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I do not understand what the problem is.

If the isinstance tuple iteration were to start using __iter__ in the future, it should start to handle all corner cases. But what is wrong now?

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue39550>
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